Slide Fastener

ABSTRACT

There is provided a slide fastener including a pair of fastener tapes each having a waterproof layer, a pair of fastener element rows each having a plurality of fastener elements, an upper opening slider, a box pin, and an insert pin. At least one recess which is elongated in a longitudinal direction of the pair of fastener tapes is formed on each of both the front and back surfaces of the box pin and both the front and back surfaces of the insert pin.

TECHNICAL FIELD

The present invention relates to a slide fastener, and moreparticularly, to a box pin, a box body and an insert pin of the slidefastener.

BACKGROUND ART

It is known that in a conventional slide fastener, a plurality offastener elements are arranged along opposing flat element attachmentedges of a pair of waterproof fastener tapes each having a waterprooflayer which covers the surface of a strip-like core material, a box pinand an insert pin are integrally fixed in an opposing manner to both thefront and back surfaces of flat one end of the pair of fastener tapes,the flat one end in which the fastener elements are not present, theslide fastener has a slider through which the fastener elements pass,and an insert pin-fixing member which extends from a portion of the sidesurface of the insert pin at a side of a tape end to both the front andback surfaces of the fastener tape and is integrally fixed (e.g., referto Patent Document 1).

PRIOR ART DOCUMENT Patent Document

Patent Document 1: Japanese Patent Application Publication No.2007-097840A

SUMMARY OF INVENTION Problems to Be Solved by Invention

In the slide fastener described in foregoing Patent Document 1,injection molding is performed in order to form the box pin, the boxbody and the insert pin on the fastener tapes. The fastener tape ispressed by using a tape-pressing member in order to fix the position ofthe fastener tape during the injection molding. However, since awaterproof layer made of synthetic resin is provided on the surface ofthe fastener tape and the tape-pressing member for pressing the edges ofthe fastener tapes in which the box pin, the box body and the insert pinare to be formed is pin-shaped, the pressing force is weak. Thus, theposition of the fastener tape may be moved due to the pressure duringthe injection molding.

Accordingly, the present invention has been made keeping in mind theabove problems, and an object of the present invention is to provide aslide fastener in which the position of a fastener tape can be reliablyfixed during injection molding.

Means for Solving Problems

The object of the present invention is achieved by the followingconfigurations.

(1) A slide fastener including a pair of fastener tapes each having awaterproof layer, a pair of fastener element rows each having aplurality of fastener elements which are respectively arranged alongopposing side edges of the pair of fastener tapes, an upper openingslider configured to disengage engagement of the pair of fastenerelement rows from above, a box pin attached to both front and backsurfaces of one end of one of the fastener tapes, the one end where thefastener elements are not present, and an insert pin attached to bothfront and back surfaces of one end of the other one of the fastenertapes, the one end where the fastener elements are not present, whereinat least one recess which is elongated in a longitudinal direction ofthe pair of fastener tapes is formed on each of both front and backsurfaces of the box pin and both the front and back surfaces of theinsert pin.

(2) The slide fastener according to (1), wherein the at least one recessincludes a plurality of recesses, and wherein at least one through-holeis formed on each of the fastener tapes at a position between theplurality of recesses.

(3) The slide fastener according to (1), further including the upperopening slider configured to disengage the engagement of the pair offastener element rows from above, and a lower opening slider configuredto disengage the engagement of the pair of fastener element rows frombelow, wherein the recess which is formed on the box pin is configuredsuch that a width dimension thereof increases with distance from thefastener elements in the longitudinal direction of the fastener tapes.

(4) The slide fastener according to (1), wherein the at least one recesswhich is formed on the insert pin includes a plurality of recesses, andwherein the front surface of the insert pin is formed with a step at aposition between the plurality of recesses.

Advantageous Effects of Invention

According to the slide fastener of the present invention, at least onerecess which is elongated in a longitudinal direction of the fastenertapes is formed on each of both the front and back surfaces of the boxpin and both the front and back surfaces of the insert pin. Thus, it ispossible to form the recesses during the injection molding whileincreasing the pressing area of the tape-pressing member for pressingthe fastener tapes to be greater than the pressing area of aconventional pin-shaped tape-pressing member. Consequently, it ispossible to reliably fix the position of the fastener tapes during theinjection molding. With this configuration, since the position of thefastener tape during the injection molding is stabilized, it is possibleto remarkably increase the attachment strength of the box pin and theinsert pin to the fastener tapes. In addition, since the pressing areaof the tape-pressing member is large, it is possible to reduce theamount of resin to be used, thereby reducing manufacturing cost.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front view depicting a first embodiment of a slide fasteneraccording to the present invention;

FIG. 2 is an enlarged perspective view illustrating the periphery of theinsert pin and the box pin which are shown in FIG. 1;

FIG. 3 is an enlarged front view illustrating the periphery of theinsert pin and the box pin which are shown in FIG. 1;

FIG. 4 is an enlarged rear view illustrating the periphery of the insertpin and the box pin which are shown in FIG. 3;

FIG. 5 is a cross-sectional view taken in the direction of arrow alongline A-A in FIG. 3;

FIG. 6 is a cross-sectional view taken in the direction of arrow alongline B-B in FIG. 3;

FIG. 7 is a cross-sectional view taken in the direction of arrow alongline C-C in FIG. 3;

FIG. 8 is an enlarged front view illustrating the periphery of theinsert pin and the box pin in a state where the lower opening slider ofthe slide fastener shown in FIG. 1 is moved in the closing direction;

FIG. 9 is a cross-sectional view illustrating the section correspondingto FIG. 5 in a state where the fastener tape is disposed within a mold;

FIG. 10 is a cross-sectional view illustrating the section correspondingto FIG. 6 in a state where the fastener tape is disposed within a mold;

FIG. 11 is an enlarged cross-sectional view depicting a modifiedembodiment of the slide fastener of the first embodiment;

FIG. 12 is a cross-sectional view illustrating the section correspondingto FIG. 11 in a state where the fastener tape is mounted within a mold;

FIG. 13 is an enlarged front view depicting a second embodiment of theslide fastener according to the present invention, and illustrating theperiphery of an insert pin and a box pin in a state where elements aredisengaged; and

FIG. 14 is an enlarged front view illustrating the periphery of theinsert pin and the box pin of the slide fastener of the secondembodiment in a state where the elements are engaged.

EMBODIMENTS OF INVENTION

Hereinafter, each embodiment of a slide fastener according to thepresent invention will be described in detail with reference to theaccompanying drawings. In the following description, as for the fastenertape, a front side refers to a near side with respect to the papersurface of FIG. 1, a back side refers to a far side with respect to thepaper surface of FIG. 1, and a direction perpendicular to the plane ofthe fastener tape may be referred to as a front-back direction. An upperside refers to an upper side with respect to the paper surface of FIG.1, a lower side refers to a lower side with respect to the paper surfaceof FIG. 1, a left side refers to a left side with respect to the papersurface of FIG. 1, and a right side refers to a right side with respectto the paper surface of FIG. 1. As for the slider, an upper side refersto a near side with respect to the paper surface of FIG. 1 (a side inwhich a pull-tab which will be described later is provided), a lowerside refers to a far side with respect to the paper surface of FIG. 1, afront side refers to an upper side with respect to the paper surface ofFIG. 1, a rear side refers to a lower side with respect to the papersurface of FIG. 1, a left side refers to a left side with respect to thepaper surface of FIG. 1, and a right side refers to a right side withrespect to the paper surface of FIG. 1. In addition, the left and rightdirection of the fastener tape and the slider is also referred to as awidth direction. In addition, an up-down direction is also referred toas a longitudinal direction of the fastener tape. The width direction isalso a direction that is parallel to the plane of the fastener tape andperpendicular to the longitudinal direction.

First Embodiment

A first embodiment of the slide fastener according to the presentinvention will be described first with reference to FIG. 1 to FIG. 12.

As shown in FIG. 1 and FIG. 2, the slide fastener 10 of this embodimentincludes a pair of left and right fastener tapes 20, a pair of left andright fastener element rows 30, an upper opening slider 40A, a loweropening slider 40B, a box pin 50, an insert pin 60 and top end stops 70.Each of the pair of left and right fastener tapes 20 has waterprooflayers 21 on front and back surfaces of a woven or knitted tapematerial. The waterproof layers 21 are made of a synthetic resinthermoplastic elastomer (e.g. polyester elastomer, polyurethaneelastomer, or the like). Each of the pair of left and right fastenerelement rows 30 has a plurality of fastener elements 31 which arerespectively arranged along opposing tape side edges 20 a of the pair ofleft and right fastener tapes 20. Each of the upper and lower openingsliders 40A, 40B passes the pair of left and right fastener element rows30 therethrough, and engage and disengage the pair of left and rightfastener element rows 30 with and from each other. The box pin 50 isattached to both the front and back surfaces of the lower end (one end)of the right (one) fastener tape 20, where the fastener elements 31 arenot present. The insert pin 60 is attached to both the front and backsurfaces of the lower end (one end) of the left (the other) fastenertape 20, where the fastener elements 31 are not present. The top endstops 70 are respectively attached to upper ends of the pair of left andright fastener tapes 20, where the fastener elements 31 are not present.

The waterproof layer 21 is a layer that does not allow fluid such aswater to pass through. Here, the fluid is not limited to water but maybe any types of liquid (fluid), for example, oil or gas. In addition,the tape material may be non-woven fabric rather than the woven orknitted material. In addition, the top end stops 70 may be provided onthe pair of left and right fastener tapes 20, or no top end stops 70 maybe provided. In this case, when attaching the slide fastener 10 to anobject such as a garment, the slide fastener 10 is attached such thatthe upper opening slider 40A is not dislodged.

Each of the pair of left and right fastener element rows 30 is composedof a plurality of fastener elements 31. Each fastener element 31 isformed on the tape side edge 20 a of the fastener tape 20 by injectionmolding using synthetic resin, such as polyamide, polyacetal,polypropylene, polybutyleneterephthalate, or the like.

The upper opening slider 40A and the lower opening slider 40B aresliders with automatic stop function, and are provided such that rearmouth sides thereof face each other.

When the upper opening slider 40A is moved upwards (in a direction awayfrom the lower opening slider 40B) by pulling a pull-tab 41, the leftand right fastener element rows 30 which are in the disengaged state areengaged with each other. When the upper opening slider 40A is moveddownwards (in a direction approaching the lower opening slider 40B), theleft and right fastener element rows 30 which are in the engaged stateare disengaged from each other. In addition, when the lower openingslider 40B is moved upwards (in a direction approaching the upperopening slider 40A) by pulling the pull-tab 41, the left and rightfastener element rows 30 which are in the engaged state are disengagedfrom each other. When the lower opening slider 40B is moved downwards(in a direction away from the upper opening slider 40A), the pair ofleft and right fastener element rows 30 which are in the disengagedstate are engaged with each other.

Each of the box pin 50 and the insert pin 60 is formed on the respectivelower ends of the tape side edges 20 a of the fastener tapes 20, asshown in FIG. 2 to FIG. 7, by injecting molding using synthetic resin,such as polyamide, polyacetal, polypropylene, polybutyleneterephthalate,or the like.

The box pin 50 is a member that is substantially rectangularcolumn-shaped. The box pin 50 is configured such that at the lower endthereof the width dimension thereof increases with distance from thefastener elements 31 in the longitudinal direction of the fastener tapes20 (in the downward direction). In addition, a stopper 51 is formed on aside surface of the upper end of the box pin 50, the side surface thatfaces the insert pin 60. The stopper 51 is configured to be engaged withan engagement recess 62 of the insert pin 60, which will be describedlater, and as shown in FIG. 8, determines an inserting position of theinsert pin 60 into the lower opening slider 40B.

The insert pin 60 is a member that is substantially rectangularcolumn-shaped. The insert pin 60 has an engagement section 61 on a sidesurface of the upper end thereof, the side surface that faces the boxpin 50. As shown in FIG. 8, the engagement section 61 is configured tobe engaged with the lowermost fastener element 31 of the fastenerelement row 30 at a side of the box pin 50. In addition, the engagementrecess 62 configured to be engaged with the stopper 51 of the box pin 50is formed on a side surface of the insert pin 60 below the engagementsection 61. In addition, as shown in FIG. 7 and FIG. 8, a step 63 isformed on the front surface of the insert pin 60 at substantially thecentral section thereof. A stop claw 44 of the lower opening slider 40Bis configured to be engaged with the step 63. As shown in FIG. 7, thethickness of the lower side of the step 63 in the front-back directionis smaller than that of the upper side of the step 63. In addition, asshown in FIG. 2 to FIG. 4, an insert pin-fixing member 64 is formed on aside surface of the lower end of the insert pin 60, the side surfacethat is directed away from the box pin 50. The insert pin-fixing member64 extends outwardly in the width direction (in a direction away fromthe box pin 50) from the side surface of the insert pin 60, and isformed on both the front and back sides of the fastener tape 20. Inaddition, the thickness of the insert pin-fixing member 64 is set to besmaller than that of the insert pin 60.

In the above-described embodiment, the insert pin 60 is a member that isto be inserted from the left side of a guide post of the upper openingslider 40A, and the box pin 50 is a member that holds the upper openingslider 40A and the lower opening slider 40B. Therefore, the insert pin60 and the box pin 50 are accommodated inside the upper opening slider40A and the lower opening slider 40B, and the dimension thereof in thefront-back direction is formed to be greater than that of the fastenertape 20. Thus, the insert pin 60 and the box pin 50 abuts flanges of theslider when the insert pin 60 and the box pin 50 are accommodated insidethe slider and this prevents the insert pin 60 and the box pin 50 fromescaping in the width direction.

Here, describing the slide fastener 10, in a state where the upperopening slider 40A and the lower opening slider 40B are moved to thelower end (to the box pin 50), the insert pin 60 is inserted into theupper opening slider 40A until the insert pin 60 is engaged with thestopper 51 of the box pin 50. Afterwards, the upper opening slider 40Ais moved upwards, so that the left and right fastener element rows 30are engaged with each other, thereby closing the slide fastener 10. Whenthe lower opening slider 40B is moved upwards in this state, the leftand right fastener element rows 30 are separated from a side of the boxpin 50 and the insert pin 60.

In this embodiment, as shown in FIG. 2 to FIG. 7, both the front andback surfaces of the box pin 50 are formed with recesses 11, 12 eachhaving a depth such that the recess 11, 12 reaches the fastener tape 20from the front or back surface of the box pin 50. Both the front andback surfaces of the insert pin 60 is formed with recesses 11, 11 havinga depth such that the recess 11 reaches the fastener tape 20 from thefront or back surface of the insert pin 60. The recesses 11, 12 areformed as tape-pressing members 81 of a mold 80 shown in FIG. 9 and FIG.10 (a mold at a side of the insert pin 60 is not shown) press thefastener tapes 20 when forming the box pin 50 and the insert pin 60 bythe injection molding. Consequently, the recesses 11 and 12 are formedat an inner side than the tape side edges 20 a of the fastener tapes 20(i.e. on the fastener tapes 20). In the meantime, reference numeral 82in FIG. 9 and FIG. 10 denotes a cavity with which molten resin is filledin order to form the box pin 50 by injection molding. Reference numeral83 denotes an element-accommodating space in which the fastener elements31 are to be accommodated during the injection molding. Since thetape-pressing members 81 press the fastener tapes 20 along the tape sideedges 20 a, the tape side edges 20 a are not waved in the front-backdirection.

In addition, the recess 11 of the box pin 50 at a side of the fastenerelement row 30 and the recesses 11 of the insert pin 60 are formed intoan elongated circular shape along the longitudinal direction of thefastener tapes 20. The recess 12 of the box pin 50 at a lower side(below the above recess 11) have a substantially trapezoidal shape alongthe longitudinal direction such that the width dimension thereofincreases with distance from the fastener elements 31 in thelongitudinal direction of the fastener tapes 20 (in the downwarddirection). In addition, as shown in FIG. 3 and FIG. 4, twotrapezoidal-shaped recesses 13 and three circular-shaped recesses 14 areformed on each of both the front and back surfaces of the insertpin-fixing member 64. In addition, as shown in FIG. 1, an recess 15which is formed into elongated circular shape along the longitudinaldirection of the fastener tapes is formed on each of both the front andback surfaces of the top end stops 70.

In addition, as shown in FIG. 3 to FIG. 7, in the right fastener tape20, fixing through-holes 22 are formed at positions above the recess 11of the box pin 50, between the recesses 11, 12, and below the recess 12.With this configuration, the box pin 50 on the front surface of thefastener tape 20 and the box pin 50 on the back surface of the fastenertape 20 are connected in the front-back direction via connectingsections 22 a which are formed in three fixing through-holes 22. In themeantime, the fixing through-holes 22 penetrate through the fastenertape 20 in the front-back direction.

In addition, in the left fastener tape 20, the fixing through-holes 22are formed at positions above the recess 11, between the recesses 11,11, and below the recess 11 of the insert pin 60. With thisconfiguration, the insert pin 60 on the front surface of the fastenertape 20 and the insert pin 60 on the back surface of the fastener tape20 are connected in the front-back direction via connecting sections 22a which are formed in three fixing through-holes 22. In addition, afixing through-hole 23 which is the same as the fixing through-holes 22is also formed at a position between upper recesses 14, 14 of the insertpin-fixing member 64.

In addition, fixing through-holes 24 are formed at forming positions ofrespective fastener elements 31 on the pair of left and right fastenertapes 20. With this configuration, the fastener elements 31 on the frontsurface of the fastener tape 20 and the fastener elements 31 on the backsurface of the fastener tape 20 are connected in the front-backdirection via connecting sections 24 a which are formed in the fixingthrough-holes 24.

As described above, according to the slide fastener 10 of thisembodiment, the recesses 11 and 12 which are elongated in thelongitudinal direction of the fastener tapes 20 are formed on both thefront and back surfaces of the box pin 50 and both the front and backsurfaces of the insert pin 60. Thus, it is possible to form the recesses11, 12 during the injection molding while increasing the pressing areaof the tape-pressing members 81 for pressing the fastener tapes 20 to begreater than the pressing area of a conventional pin-shapedtape-pressing member. It is therefore possible to reliably fix theposition of the fastener tapes 20 in the width direction and in thefront-back direction during the injection molding. With thisconfiguration, since the position of the fastener tapes 20 during theinjection molding is stabilized when forming the box pin 50 and theinsert pin 60 on the fastener tapes 20 having the waterproof layer 21,it is therefore possible to remarkably increase the attachment strengthof the box pin 50 and the insert pin 60 to the fastener tapes 20. Inaddition, since the pressing area of the tape-pressing members 81 islarge, it is possible to reduce the amount of resin to be used, therebyreducing manufacturing cost. Furthermore, the longitudinal dimension ofeach of the recesses 11, 12 is greater than the width dimension thereof,preferably, the longitudinal dimension is more than twice the widthdimension, and more preferably, the longitudinal direction is more thanthree times the width dimension.

In addition, according to the slide fastener 10 of this embodiment, thefixing through-holes 22 are formed on the fastener tapes 20 at positionsbetween the recesses 11, 12 (11, 11), and the box pin 50 and the insertpin 60 are connected in the front-back direction via the fixingthrough-holes 22 in a state where the fastener tapes 20 are reliablypressed. Thus, it is possible to further increase the attachmentstrength of the box pin 50 and the insert pin 60 to the fastener tapes20.

In addition, according to the slide fastener 10 of this embodiment, therecess 12 which is formed on the box pin 50 is configured such that thewidth dimension thereof increases with distance from the fastenerelements 31 in the longitudinal direction of the fastener tapes 20.Thus, it is therefore possible to further increase the pressing area ofthe tape-pressing members 81 at the lower end side of the fastener tape20, thereby further reliably fixing the position of the fastener tape 20during the injection molding. In addition, it is possible to furtherdecrease the amount of resin to be used, thereby further reducing themanufacturing cost.

In addition, in order to maintain the strength of the box pin 50 and theinsert pin 60, it is preferable to form the recesses 11 of the insertpin 60 so as to be positioned below the engagement section 61, as shownin FIG. 8. Consequently, in a state where the engagement section 61 isengaged with the lowermost fastener element 31 at a side of the box pin50, the strength can sufficiently stand against lateral pulling force.Further, the lower recess 11 of the recesses 11 of the insert pin 60 ispositioned at a left side relative to an abutting position between thestep 63 and the stop claw 44 in a state where the lower opening slider40B abuts against the step 63. This consequently prevents the stop claw44 of the lower opening slider 40B from being clogged in the recess 11.In addition, the recesses 11 of the box pin 50 are formed so as to bepositioned below the surface in which the stopper 51 is engaged with theengagement recess 62 of the insert pin 60. Thus, the attachment strengthcan be maintained.

In addition, according to the slide fastener 10 of this embodiment, aplurality of recesses 11, 11 are formed on the insert pin 60 and thestep 63 is formed at a position between the recesses 11, 11 on the frontsurface of the insert pin 60. It is therefore possible to form the step63 at a suitable position of the insert pin 60 on which the recesses 11and 11 are formed.

As a modified embodiment of this embodiment, as shown in FIG. 11 andFIG. 12, the waterproof layer 21 may be provided only on the frontsurface of the fastener tapes 20.

Second Embodiment

In sequence, a second embodiment of the slide fastener according to thepresent invention is described with reference to FIG. 13 and FIG. 14. Inthe meantime, as for the same or equivalent portions as the firstembodiment, the same reference numerals will be used in the drawings anddescriptions of some features will be omitted or simplified.

As shown in FIG. 13 and FIG. 14, the fastener 10 of this embodiment usesan opening unit 90 in place of an inverse opening unit which includesthe box pin 50, the insert pin 60 and the lower opening slider 40B inthe first embodiment. Therefore, although not shown, the slide fastener10 of this embodiment has only the upper opening slider 40A.

The opening unit 90 includes the box pin 50, a box body 55 and theinsert pin 60. The box pin 50 and the box body 55 are formed on thelower end of the tape side edge 20 a of the right fastener tape 20. Theinsert pin 60 is formed on the lower end of the tape side edge 20 a ofthe left fastener tape 20, and can be inserted into the box body 55.

The box body 55 is integrally molded on the lower section of the box pin50, and an insert pin-receiving space 56 is formed in the left halfsection of the box body 55. The insert pin-receiving space 56 is openedin the up-down direction such that the insert pin 60 is insertedthereinto. In addition, a slit 57 a is formed on a sidewall section 57at a side of the insert pin 60, the sidewall section defining the insertpin-receiving space 56, such that the insert pin-fixing member 64 of theinsert pin 60 is to be inserted thereinto. In addition,rectangular-shaped recesses 16 are formed on both the front and backsurfaces of the right half section of the box body 55, along thelongitudinal direction of the fastener tapes 20. Each recess 16 has adepth such that the recess 16 reaches the fastener tape 20. Although thebox pin 50 and the box body 55 are integrally molded in this embodiment,this is not limited. The box pin 50 and the box body 55 may be molded asseparate pieces, and the box body 55 may be engaged with and fixed tothe lower section of the box pin 50.

As described above, according to the slide fastener 10 of thisembodiment, the recesses 11, 16 which are elongated in the longitudinaldirection of the fastener tapes 20 are formed on both the front and backsurfaces of the box pin 50, the box body 55 and the insert pin 60. Thus,it is possible to form the recesses 11, 16 during the injection moldingwhile increasing the pressing area of the tape-pressing members forpressing the fastener tapes 20 to be greater than the pressing area of aconventional pin-shaped tape-pressing member. Consequently, it ispossible to reliably fix the position of the fastener tapes 20 in thewidth direction and in the front-back direction during the injectionmolding. With this configuration, since the position of the fastenertapes 20 during the injection molding is stabilized when forming the boxpin 50 and the insert pin 60 on the fastener tapes 20 having thewaterproof layer 21, it is therefore possible to remarkably increase theattachment strength of the box pin 50, the box body 55 and the insertpin 60 to the fastener tapes 20. In addition, since the pressing area ofthe tape-pressing members is large, it is possible to reduce the amountof resin to be used, thereby reducing manufacturing cost.

The other configurations, operations and advantageous effects are thesame as those of the above-described first embodiment.

In the meantime, the present invention is not limited to those that wereillustrated in the foregoing embodiments but can be suitably changedwithout departing from the concept of the invention.

In an example, the fastener element row can be prepared by other methodsthan the injection molding. Specifically, coil-type fastener elementswhich are formed by molding a mono-filament into the shape of a coil maybe arranged on the tape side edge 20 a.

DESCRIPTION OF REFERENCE NUMERALS

10 Slide Fastener

11 Recess

12 Recess

16 Recess

20 Fastener Tape

20 a Tape Side Edge

21 Waterproof Layer

22 Fixing Through-Hole

30 Fastener Element Row

31 Fastener Element

40 a Upper Opening Slider

40B Lower Opening Slider

50 Box Pin

55 Box Body

60 Insert Pin

1. A slide fastener comprising: a pair of fastener tapes each having awaterproof layer; a pair of fastener element rows each having aplurality of fastener elements which are respectively arranged alongopposing side edges of the pair of fastener tapes; an upper openingslider configured to disengage engagement of the pair of fastenerelement rows from above; a box pin attached to both front and backsurfaces of one end of one of the fastener tapes, the one end where thefastener elements are not present; and an insert pin attached to bothfront and rear surfaces of one end of the other one of the fastenertapes, the one end where the fastener elements are not present, whereinat least one recess which is elongated in a longitudinal direction ofthe pair of fastener tapes is formed on each of both front and backsurfaces of the box pin and both front and back surfaces of the insertpin.
 2. The slide fastener according to claim 1, wherein the at leastone recess comprises a plurality of recesses, and wherein at least onethrough-hole is formed on each of the fastener tapes at a positionbetween the plurality of recesses.
 3. The slide fastener according toclaim 1, further comprising: the upper opening slider configured todisengage the engagement of the pair of fastener element rows fromabove; and a lower opening slider configured to disengage the engagementof the pair of fastener element rows from below, wherein the recesswhich is formed on the box pin is configured such that a width dimensionthereof increases with distance from the fastener elements in thelongitudinal direction of the fastener tapes.
 4. The slide fasteneraccording to claim 1, wherein the at least one recess which is formed onthe insert pin comprises a plurality of recesses, and wherein the frontsurface of the insert pin is formed with a step at a position betweenthe plurality of recesses.